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CVE-2021-23401

Date: July 5, 2021

This affects all versions of package Flask-User. When using the make_safe_url function, it is possible to bypass URL validation and redirect a user to an arbitrary URL by providing multiple back slashes such as /////evil.com/path or \\\evil.com/path. This vulnerability is only exploitable if an alternative WSGI server other than Werkzeug is used, or the default behaviour of Werkzeug is modified using 'autocorrect_location_header=False.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2021-23401
https://github.com/lingthio/Flask-User/blob/master/flask_user/user_manager__utils.py
https://github.com/lingthio/Flask-User
https://github.com/pypa/advisory-database/tree/main/vulns/flask-user/PYSEC-2021-337.yaml
https://github.com/advisories/GHSA-4298-89hc-6rfv
https://www.mend.io/vulnerability-database/CVE-2021-23401

Severity Score

Weakness Type (CWE)

URL Redirection to Untrusted Site ('Open Redirect')

CWE-601

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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